list of the lists - append after search

Sun Mar 5 11:09:01 EST 2017

On Thursday, March 2, 2017 at 9:33:14 PM UTC+5:30, Andrew Zyman wrote:
> Hello,
> please advise.
>> I'd like search and append the internal list in the list-of-the-lists.
>> Example:
> ll =[ [a,1], [b,2], [c,3], [blah, 1000] ]
>> i want to search for the internal [] based on the string field and, if matches, append that list with a value.
>> if internal_list[0] == 'blah':
> ll[ internal_list].append = [ 'new value']
>> End result:
> ll =[ [a,1], [b,2], [c,3], [blah, 1000, 'new value'] ]
>>> I came up with the following, but the second stmnt is not correct:
>> print [x for x in ll if x[0]== 'blah']
> print ll.index([x for x in ll if x[0]=='blah'])
>> output:
> ValueError: [['blah', 1]] is not in list
>>>>> thank you
> AZ

list_of_lists = [['a', 1], ['b', 2], ['c', 3], ['blah', 1000]]
for sublist in list_of_lists:
 if sublist[0] == 'blah':
 sublist.append('new value')
Hope that helps.